Kim Kardashian and Kanye West are reportedly expecting their third child and are said to be "over the moon" about their new arrival.

The queen of reality TV and the rapper are set to give their son, Saint, who is 21-months-old and their four-year-old daughter daughter, North, a new sibling early next year.

The couple have hired a surrogate because of Kim's medical condition - placenta accreta - that caused medical complications during her second pregnancy.

A source confirmed the news to People magazine, revealing that "the entire family is over the moon".

"Kim had been looking for a surrogate for months until recently when she found the perfect candidate.

"Given her health scares in the past, Kim felt the need to hire a surrogacy agency that helped serve as the liaison in finding a healthy woman who would be a great surrogate option for her and Kanye. Both of them have been super involved in the process."

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It is claimed the new addition to their clan is due at the end of January 2018, with TMZ further stating that the duo paid $45,000 for the surrogate, who is apparently doing well as her pregnancy progresses.